I'm trying to achieve something like FM radio quality.…Does anyone have any tips on how I can improve my encodes in Lame?

To achieve something like FM radio quality, you can code in “mp3 CBR-128 kbps”. Listened to and verified on spectrum analyzer display on music and white noise samples. FM radio frequency band is 30…15000 Hz, “mp3 CBR-128 kbps” frequency band is 30…16000 Hz. If you want to simulate FM radio sound/noise ratio for the best reception conditions too, add hiss at “minus 60 dB” relative to the 0 dB (peak) level of a program listened to.